i've got my knight goby a plastic driftwood with a cave at the bottom, and it's been hiding in it ever since it found the cave as a hideout. it only come out at night, or when no one's at home so i'm assume it's afraid of humans. thw thing is due to its hiding, i've not been able to feed it for about 4 days. i've put food right at the entrance of its cave, but it won't come out(it sticks to the ceiling of the cave, so it stays invisible from the entrance of the cave). i've got a f8 puffer with it (in a 20 gallon), but since it comes out when the whole family is out, the it doesn't seem to be afraid of the puffer. the water is perfect (pH: 8 / NH3: 0 / NO2: 0 / NO3: <15 / SG:1.005) so it isn't affected by the water. how can i get it to come out and eat? i've tried the garlic guard, but it stills stays in the cave.